SOLUTION: -2{{{ sqrt( 16y^4) }}}-{{{ sqrt( 27y^8) }}}+{{{ sqrt( 81) }}} *except all of the roots are not squared, they are cubed.* I need to know how to simplify and combine li

Algebra ->  Radicals -> SOLUTION: -2{{{ sqrt( 16y^4) }}}-{{{ sqrt( 27y^8) }}}+{{{ sqrt( 81) }}} *except all of the roots are not squared, they are cubed.* I need to know how to simplify and combine li      Log On


   



Question 440905:
-2+sqrt%28+16y%5E4%29+-+sqrt%28+27y%5E8%29+++sqrt%28+81%29+
*except all of the roots are not squared, they are cubed.*
I need to know how to simplify and combine like radicals.
Thanks,
Katie

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
-2+root%283%2C16y%5E4%29+-+root%283%2C27y%5E8%29+%2B+root%283%2C81%29+
*except all of the roots are not squared, they are cubed.*
It's cube root, not cubed root.
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-2+root%283%2C8y%5E3%2A2y%29+-+root%283%2C27y%5E6%2Ay%5E2%29+%2B+root%283%2C27%2A3%29+
= -2+2y%2Aroot%283%2C2y%29+-+3y%5E2%2Aroot%283%2Cy%5E2%29+%2B+3root%283%2C3%29+
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Nothing can be combined.
It's not clear what the leading -2 applies to.